SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7453a87a22bde8af73f541920076b6bc6282508450a7eb9f1493ccf2be325c5e' 
  AND token = 'zhb+G1h91SEH5MNn3n9FRpj/zrXOKzywB4GkuT2Ct4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}